Method for machining a multiple material workpiece by electrical discharge machining

A die-sinking machining apparatus (100) for machining a multiple material workpiece (2,3) including at least two distinct phases comprising a generator control module (202) configured to control a generator (203, 203′) for applying discrete pulses to a gap between an electrode (1) and the multiple material workpiece, whereas an ignition voltage is applied to the gap to provoke a dielectric breakdown and a discharge current pulse is then applied to cause a material removal or material remelting,

• comprising wherein the apparatus further comprises a gap acquisition module (205) configured to monitor a process signal that settles with or after the dielectric breakdown, wherein the general control module (201) is configured to identify in real time the distinct phase of the multiple material workpiece at which a present discharge occurs based on the monitored process signal, and wherein the generator control module is further configured to adapt at least one pulse parameter setting of the present discharge current pulse based on the identified distinct phase of the multiple material workpiece.